condition mean min max ZT0-3 67.942275 65.5388 70.34575000000001 ZT4-7 92.90129999999999 92.90129999999999 92.90129999999999 ZT8-11 100.75455 100.75455 100.75455 ZT12-15 0 0 0 ZT16-19 123.679 123.679 123.679 ZT20-23 136.417 136.417 136.417